Network · AS3926

AS3926 Fairfax County Dept of Information Technology

AS3926 (Fairfax County Dept of Information Technology) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS3926

  • OwnerFairfax County Dept of Information Tec
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses69,632
  • IPv4 ranges2
  • IPv6 ranges0
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 166.94.0.0/16
  • 198.24.16.0/20

Ranges and owner from DB-IP (CC BY 4.0), updated 2026-10-21.

Check an IP address →

Detect it in code

Spot AS3926 traffic at signup.

Send the visitor's IP. The response includes the ASN, the owner and flags.hosting.

curl https://veqen-app.com/v1/ip/check \
  -H "Authorization: Bearer $VEQEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"ip": "203.0.113.7"}'
import os, requests

r = requests.post(
    "https://veqen-app.com/v1/ip/check",
    headers={"Authorization": f"Bearer {os.environ['VEQEN_API_KEY']}"},
    json={"ip": "203.0.113.7"},
    timeout=10,
)
result = r.json()
print(result["risk"]["verdict"], result["risk"]["reasons"])
const res = await fetch("https://veqen-app.com/v1/ip/check", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.VEQEN_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"ip": "203.0.113.7"}),
});
const result = await res.json();
console.log(result.risk.verdict, result.risk.reasons);
Questions

About AS3926

Is AS3926 a datacenter or VPN network?

AS3926 (Fairfax County Dept of Information Technology) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS3926?

AS3926 is registered to Fairfax County Dept of Information Technology. It announces about 69,632 IPv4 addresses.

How do I detect traffic from AS3926?

Call the Veqen IP check with the visitor's address. The response includes the ASN, the owner and whether the network is a datacenter, VPN network, relay or ISP.